COMPOSER_PATH error on multi app

Hi all.

I've try to develop multi app using one Installation. Public folder, vendor folder, tests folder, writeable folder, etc, is used by all apps. Just app folder and .env file I put into different folder. So the folder structure like image below.

Code:

/_bar
  /app
  .env
/_foo
  /app
  .env
/public
/tests
/vendor
/writeable
composer.json
composer.lock
spark

This is the code on spark file line 44

Code:

require realpath('_bar/app/Config/Paths.php') ?: '_bar/app/Config/Paths.php';

This is the code on public/index.php line 15 - 66

Code:

$location = (substr($_SERVER['HTTP_HOST'], 0, 9) == 'localhost') ? 'local' : 'hosting';
defined('LOKASI') || define('LOKASI', $location);

switch ($location) {
    case 'local':
        switch ($_SERVER['SERVER_PORT']) {
            case '8081':
                $apl = 'bar';
                break;

            default:
                $apl = 'foo';
                break;
        }
        break;

    default:
        $domain = $_SERVER['HTTP_HOST'];
        $subdomain = explode('.', $domain)[0];
        switch ($subdomain) {
            case 'www':
                $apl = 'foo';
                break;

            case 'sub':
                $apl = 'bar';
                break;

            default:
                $apl = 'foo';
                break;
        }
        break;
}

require realpath(FCPATH . '../_' . $apl . '/app/Config/Paths.php') ?: FCPATH . '../_' . $apl . '/app/Config/Paths.php';

It's work, but composer didn't load

If I change the COMPOSER_PATH on Constants file

This is the code for _bar/app/Config/Constants.php line 26

Code:

defined('COMPOSER_PATH') || define('COMPOSER_PATH', ROOTPATH . '../vendor/autoload.php');

I got error:

Code:

Fatal error: Uncaught Error: Class 'Config\App' not found in D:\_DEV\PHP - CI4\multiapp\vendor\codeigniter4\framework\system\bootstrap.php:158 Stack trace: #0 D:\_DEV\PHP - CI4\multiapp\public\index.php(73): require() #1 D:\_DEV\PHP - CI4\multiapp\vendor\codeigniter4\framework\system\Commands\Server\rewrite.php(45): require_once('D:\\_DEV\\PHP - C...') #2 {main} thrown in D:\_DEV\PHP - CI4\multiapp\vendor\codeigniter4\framework\system\bootstrap.php on line 158

Full code on my github: https://github.com/itutu-media/multiapp

Please help.

Regards,
Itutu Media